<template>
  <transition name="showHeader">
    <div v-if="visible" class="header-animat">
      <a-layout-header
        v-if="visible"
        :class="[fixedHeader && 'ant-header-fixedHeader', sidebarOpened ? 'ant-header-side-opened' : 'ant-header-side-closed', ]"
        :style="{ padding: '0' }">
        <div v-if="mode === 'sidemenu'" class="header">
          <a-icon v-if="device==='mobile'" class="trigger" :type="collapsed ? 'menu-fold' : 'menu-unfold'"
                  @click="toggle"/>
          <a-icon v-else class="trigger" :type="collapsed ? 'menu-unfold' : 'menu-fold'" @click="toggle"/>
          <user-menu></user-menu>
        </div>
        <div v-else :class="['top-nav-header-index', theme]">
          <div class="header-index-wide">
            <div class="header-index-left">
              <logo class="top-nav-header" :show-title="device !== 'mobile'"/>
              <s-menu v-if="device !== 'mobile'" mode="horizontal" :menu="menus" :theme="theme"/>
              <a-icon v-else class="trigger" :type="collapsed ? 'menu-fold' : 'menu-unfold'" @click="toggle"/>
            </div>
            <user-menu class="header-index-right"></user-menu>
          </div>
        </div>
      </a-layout-header>
    </div>
  </transition>
</template>
<script>
import UserMenu from '../tools/UserMenu';
import SMenu from '../Menu';
import Logo from '../tools/Logo';
import { mixin } from '@/utils/mixin';

export default {
  name: 'GlobalHeader',
  components: {
    UserMenu,
    SMenu,
    Logo,
  },
  mixins: [mixin],
  props: {
    mode: {
      type: String,
      default: 'sidemenu',
    },
    menus: {
      type: Array,
      required: true,
    },
    theme: {
      type: String,
      required: false,
      default: 'dark',
    },
    collapsed: {
      type: Boolean,
      required: false,
      default: false,
    },
    device: {
      type: String,
      required: false,
      default: 'desktop',
    },
  },
  data() {
    return {
      visible: true,
      oldScrollTop: 0,
    };
  },
  mounted() {
    document.body.addEventListener('scroll', this.handleScroll, { passive: true });
  },
  methods: {
    handleScroll() {
      if (!this.autoHideHeader) {
        return;
      }

      const scrollTop = document.body.scrollTop + document.documentElement.scrollTop;
      if (!this.ticking) {
        this.ticking = true;
        requestAnimationFrame(() => {
          if (this.oldScrollTop > scrollTop) {
            this.visible = true;
          } else if (scrollTop > 300 && this.visible) {
            this.visible = false;
          } else if (scrollTop < 300 && !this.visible) {
            this.visible = true;
          }
          this.oldScrollTop = scrollTop;
          this.ticking = false;
        });
      }
    },
    toggle() {
      this.$emit('toggle');
    },
  },
  beforeDestroy() {
    document.body.removeEventListener('scroll', this.handleScroll, true);
  },
};
</script>
<style lang="stylus">
  .header-animat
    position: relative;
    z-index: 999;

  .showHeader-enter-active
    transition: all 0.25s ease;

  .showHeader-leave-active
    transition: all 0.5s ease;

  .showHeader-enter, .showHeader-leave-to
    opacity: 0;
</style>
